Tuan Vu, 43, of Annandale, plead guilty on Tuesday to committing health care fraud at his dentist practice in Alexandria.

Vu, who owns Cosmetic & Family Dentistry, PLLC, was charged by criminal information with health care fraud for “fraudulently billing insurance providers hundreds of thousands of dollars for dental services that he did not provide to his patients,” according to a news release from the U.S. Attorney’s office.

Hulk Hogan's mouth is seriously messed up, after a dentist accidentally ripped out 50 stitches from his mouth.

Hulk tells TMZ ... in October he went in for dental surgery to get implants. The doctor performed a sinus graft -- placing a donor bone in the mouth to support the implant. Hulk then went to a cosmetic surgeon to begin the implant process. When the doc removed the mold in Hulk's mouth, it ripped out around 50 stitches from the donor bone procedure.

Hulk says he's been dealing with the problem ever since ... his mouth became infected and the antibiotics just weren't doing the trick.

So recently Hulk had a CAT scan, which revealed -- get this -- that one of the doctors left a metal tack in his mouth.

SiteSpect, Inc., the leading provider of non-intrusive optimization solutions, today announced that 1-800-DENTIST, the largest dental-patient matching service in the United States, has selected SiteSpect as its multivariate testing and behavioral targeting platform.

Used by more than 6.5 million people every year, 1-800-Dentist serves all 50 states and has been consistently ranked as one of the nation’s top brands by BRANDWEEK. The company plans to leverage SiteSpect’s multivariate testing and behavioral targeting to provide deep statistical data on every component of its web site in order to provide customers with a better site experience and increase conversions.

“1-800-DENTIST has been helping people find the right dentist since 1986. In recent years, we’ve greatly expanded our online presence to match how today’s consumer wants to interact with us,” said Michael Turner, President of 1-800-DENTIST. “That’s why we turned to SiteSpect. Their record of success in helping increase the effectiveness of B2C websites through rigorous testing and improvement programs is impressive. The fact that SiteSpect offers a unique, non-intrusive approach to testing was an important factor in our decision.”